Sometimes you cant help but feel that the deaths of certain characters are due because of their nature. Even before Daenerys and her army reached Meereen, it was demonstrated what the slave masters there were like as the troops marched past a huge number of children crucified alongside the road to the city. You would think that they should have heard about the Khaleesis views of slavers and perhaps made the journey a little more welcoming. So it seems only natural that upon taking the city and releasing the slaves that she would enact the same punishment on the Great Masters that they themselves did to all those beforehand. While the scenes of those men being nailed up is memorable, perhaps what makes it even more so is the resulting after-effect. In The Laws of Gods and Men, Hizdahr zo Loraq beseeches Daenerys to allow his fathers corpse to be cut down from one of those crucifixes. This request sticks in both Khaleesis mind and in the viewers because of its nature, and in fact a couple of episodes later, she installs the man as her Ambassador to the city of Yunkai. But he also makes us see the impact on the families behind the crucifixion of the Masters and that makes it all the more poignant.